/**
 * Software License, Version 1.0
 * 
 * Copyright 2003 The Trustees of Indiana University.  All rights reserved.
 * 
 *
 *Redistribution and use in source and binary forms, with or without 
 *modification, are permitted provided that the following conditions are met:
 *
 *1) All redistributions of source code must retain the above copyright notice,
 * the list of authors in the original source code, this list of conditions and
 * the disclaimer listed in this license;
 *2) All redistributions in binary form must reproduce the above copyright 
 * notice, this list of conditions and the disclaimer listed in this license in
 * the documentation and/or other materials provided with the distribution;
 *3) Any documentation included with all redistributions must include the 
 * following acknowledgement:
 *
 *"This product includes software developed by the Community Grids Lab. For 
 * further information contact the Community Grids Lab at 
 * http://communitygrids.iu.edu/."
 *
 * Alternatively, this acknowledgement may appear in the software itself, and 
 * wherever such third-party acknowledgments normally appear.
 * 
 *4) The name Indiana University or Community Grids Lab or NaradaBrokering, 
 * shall not be used to endorse or promote products derived from this software 
 * without prior written permission from Indiana University.  For written 
 * permission, please contact the Advanced Research and Technology Institute 
 * ("ARTI") at 351 West 10th Street, Indianapolis, Indiana 46202.
 *5) Products derived from this software may not be called NaradaBrokering, 
 * nor may Indiana University or Community Grids Lab or NaradaBrokering appear
 * in their name, without prior written permission of ARTI.
 * 
 *
 * Indiana University provides no reassurances that the source code provided 
 * does not infringe the patent or any other intellectual property rights of 
 * any other entity.  Indiana University disclaims any liability to any 
 * recipient for claims brought by any other entity based on infringement of 
 * intellectual property rights or otherwise.  
 *
 *LICENSEE UNDERSTANDS THAT SOFTWARE IS PROVIDED "AS IS" FOR WHICH NO 
 *WARRANTIES AS TO CAPABILITIES OR ACCURACY ARE MADE. INDIANA UNIVERSITY GIVES
 *NO WARRANTIES AND MAKES NO REPRESENTATION THAT SOFTWARE IS FREE OF 
 *INFRINGEMENT OF THIRD PARTY PATENT, COPYRIGHT, OR OTHER PROPRIETARY RIGHTS. 
 *INDIANA UNIVERSITY MAKES NO WARRANTIES THAT SOFTWARE IS FREE FROM "BUGS", 
 *"VIRUSES", "TROJAN HORSES", "TRAP DOORS", "WORMS", OR OTHER HARMFUL CODE.  
 *LICENSEE ASSUMES THE ENTIRE RISK AS TO THE PERFORMANCE OF SOFTWARE AND/OR 
 *ASSOCIATED MATERIALS, AND TO THE PERFORMANCE AND VALIDITY OF INFORMATION 
 *GENERATED USING SOFTWARE.
 */

package cgl.narada.util.logging;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;


public class SimpleLogger implements Logger {


    private static DateFormat dateFormat = 
	new SimpleDateFormat("yyyy/MM/dd HH:mm:ss:SSS zzz");

    public static final int LEVEL_DEBUG  = 1;

    public static final int LEVEL_INFO   = 2;

    public static final int LEVEL_WARN   = 3;

    public static final int LEVEL_ERROR  = 4;

    public static final int LEVEL_FATAL  = 5;

    public static final int LEVEL_ALL    = (LEVEL_DEBUG - 1);

    public static final int LEVEL_OFF    = (LEVEL_FATAL + 1);
    
    private String logName = null;
    private int currentLevel = 0;

    /**
     *
     */
    public SimpleLogger(String name) {
        logName = name;
        //setLevel(SimpleLogger.LEVEL_INFO);
    }

    /**
     * 
     */
    public void setLevel(int currentLevel) {
        this.currentLevel = currentLevel;

    }

    /**
     * 
     */
    public int getLevel() {
        return currentLevel;
    }

    /**
     *
     */
    private void log(int level, Object message, Throwable t) {
     
        StringBuffer buf = new StringBuffer();

	buf.append(dateFormat.format(new Date()));
	buf.append(" ");

        // append a readable representation of the log leve
        switch(level) {
            case SimpleLogger.LEVEL_DEBUG: buf.append("[DEBUG] "); break;
            case SimpleLogger.LEVEL_INFO:  buf.append("[INFO] ");  break;
            case SimpleLogger.LEVEL_WARN:  buf.append("[WARN] ");  break;
            case SimpleLogger.LEVEL_ERROR: buf.append("[ERROR] "); break;
            case SimpleLogger.LEVEL_FATAL: buf.append("[FATAL] "); break;
        }

        // append the name of the log instance 
	buf.append(String.valueOf(logName)).append(" - ");

	// append the message
        buf.append(String.valueOf(message));

        // append stack trace if not null
        if(t != null) {
            buf.append(" <");
            buf.append(t.toString());
            buf.append(">");

	    StackTraceElement[] ste = t.getStackTrace();
	    for (int i = 0; i<ste.length; i++){
		buf.append(ste.toString());
	    }
        }

        System.err.println(buf.toString());
    }


    /**
     *
     */
    private boolean isLevelEnabled(int level) {
	return (level >= currentLevel);
    }

    /**
     * 
     */
    public  void debug(Object message) {

        if (isLevelEnabled(SimpleLogger.LEVEL_DEBUG)) {
            log(SimpleLogger.LEVEL_DEBUG, message, null);
        }
    }

    /**
     * 
     */
    public  void debug(Object message, Throwable t) {

        if (isLevelEnabled(SimpleLogger.LEVEL_DEBUG)) {
            log(SimpleLogger.LEVEL_DEBUG, message, t);
        }
    }

    /**
     * 
     */
    public  void info(Object message) {

        if (isLevelEnabled(SimpleLogger.LEVEL_INFO)) {
            log(SimpleLogger.LEVEL_INFO, message, null);
        }
    }


    /**
     * 
     */
    public  void info(Object message, Throwable t) {

        if (isLevelEnabled(SimpleLogger.LEVEL_INFO)) {
            log(SimpleLogger.LEVEL_INFO, message, t);
        }
    }


    /**
     * 
     */
    public  void warn(Object message) {

        if (isLevelEnabled(SimpleLogger.LEVEL_WARN)) {
            log(SimpleLogger.LEVEL_WARN, message, null);
        }
    }


    /**
     * 
     */
    public  void warn(Object message, Throwable t) {

        if (isLevelEnabled(SimpleLogger.LEVEL_WARN)) {
            log(SimpleLogger.LEVEL_WARN, message, t);
        }
    }


    /**
     * <p> Log a message with error log level.</p>
     */
    public  void error(Object message) {

        if (isLevelEnabled(SimpleLogger.LEVEL_ERROR)) {
            log(SimpleLogger.LEVEL_ERROR, message, null);
        }
    }


    /**
     * 
     */
    public  void error(Object message, Throwable t) {

        if (isLevelEnabled(SimpleLogger.LEVEL_ERROR)) {
            log(SimpleLogger.LEVEL_ERROR, message, t);
        }
    }


    /**
     * 
     */
    public  void fatal(Object message) {

        if (isLevelEnabled(SimpleLogger.LEVEL_FATAL)) {
            log(SimpleLogger.LEVEL_FATAL, message, null);
        }
    }


    /**
     * 
     */
    public  void fatal(Object message, Throwable t) {

        if (isLevelEnabled(SimpleLogger.LEVEL_FATAL)) {
            log(SimpleLogger.LEVEL_FATAL, message, t);
        }
    }


    /**
     * 
     */
    public  boolean isDebugEnabled() {

        return isLevelEnabled(SimpleLogger.LEVEL_DEBUG);
    }


    /**
     * 
     */
    public  boolean isErrorEnabled() {

        return isLevelEnabled(SimpleLogger.LEVEL_ERROR);
    }


    /**
     * 
     */
    public  boolean isFatalEnabled() {

        return isLevelEnabled(SimpleLogger.LEVEL_FATAL);
    }


    /**
     *
     */
    public  boolean isInfoEnabled() {

        return isLevelEnabled(SimpleLogger.LEVEL_INFO);
    }

    /**
     *
     */
    public  boolean isWarnEnabled() {

        return isLevelEnabled(SimpleLogger.LEVEL_WARN);
    }

}

